LeetCode.62-unique-paths

class Solution {
    public int uniquePaths(int m, int n) {
        
        int[][] paths = new int[m][n];
        for(int i=0;i<m;i++){
            for(int j=0;j<n;j++){
                if(i==0||j==0){
                    paths[i][j] = 1;
                }else{
                    paths[i][j] = paths[i-1][j]+paths[i][j-1]
                }             
            }      
        }
        return paths[m-1][n-1]
    }
}